Complex classes like Schema often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use Schema, and based on these observations, apply Extract Interface, too.
| 1 | <?php  | 
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| 13 | class Schema implements \JsonSerializable, \ArrayAccess { | 
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| 14 | /**  | 
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| 15 | * Trigger a notice when extraneous properties are encountered during validation.  | 
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| 16 | */  | 
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| 17 | const VALIDATE_EXTRA_PROPERTY_NOTICE = 0x1;  | 
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| 18 | |||
| 19 | /**  | 
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| 20 | * Throw a ValidationException when extraneous properties are encountered during validation.  | 
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| 21 | */  | 
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| 22 | const VALIDATE_EXTRA_PROPERTY_EXCEPTION = 0x2;  | 
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| 23 | |||
| 24 | /**  | 
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| 25 | * @var array All the known types.  | 
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| 26 | *  | 
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| 27 | * If this is ever given some sort of public access then remove the static.  | 
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| 28 | */  | 
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| 29 | private static $types = [  | 
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| 30 | 'array' => ['a'],  | 
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| 31 | 'object' => ['o'],  | 
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| 32 | 'integer' => ['i', 'int'],  | 
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| 33 | 'string' => ['s', 'str'],  | 
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| 34 | 'number' => ['f', 'float'],  | 
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| 35 | 'boolean' => ['b', 'bool'],  | 
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| 36 | 'timestamp' => ['ts'],  | 
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| 37 | 'datetime' => ['dt'],  | 
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| 38 | 'null' => ['n']  | 
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| 39 | ];  | 
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| 40 | |||
| 41 | /**  | 
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| 42 | * @var string The regular expression to strictly determine if a string is a date.  | 
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| 43 | */  | 
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| 44 |     private static $DATE_REGEX = '`^\d{4}-\d{2}-\d{2}([ T]\d{2}:\d{2}(:\d{2})?)?`i'; | 
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| 45 | |||
| 46 | private $schema = [];  | 
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| 47 | |||
| 48 | /**  | 
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| 49 | * @var int A bitwise combination of the various **Schema::FLAG_*** constants.  | 
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| 50 | */  | 
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| 51 | private $flags = 0;  | 
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| 52 | |||
| 53 | /**  | 
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| 54 | * @var array An array of callbacks that will filter data in the schema.  | 
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| 55 | */  | 
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| 56 | private $filters = [];  | 
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| 57 | |||
| 58 | /**  | 
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| 59 | * @var array An array of callbacks that will custom validate the schema.  | 
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| 60 | */  | 
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| 61 | private $validators = [];  | 
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| 62 | |||
| 63 | /**  | 
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| 64 | * @var string|Validation The name of the class or an instance that will be cloned.  | 
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| 65 | */  | 
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| 66 | private $validationClass = Validation::class;  | 
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| 67 | |||
| 68 | |||
| 69 | /// Methods ///  | 
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| 70 | |||
| 71 | /**  | 
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| 72 |      * Initialize an instance of a new {@link Schema} class. | 
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| 73 | *  | 
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| 74 | * @param array $schema The array schema to validate against.  | 
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| 75 | */  | 
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| 76 | 191 |     public function __construct($schema = []) { | 
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| 79 | |||
| 80 | /**  | 
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| 81 | * Grab the schema's current description.  | 
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| 82 | *  | 
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| 83 | * @return string  | 
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| 84 | */  | 
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| 85 | 1 |     public function getDescription() { | 
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| 88 | |||
| 89 | /**  | 
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| 90 | * Set the description for the schema.  | 
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| 91 | *  | 
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| 92 | * @param string $description The new description.  | 
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| 93 | * @throws \InvalidArgumentException Throws an exception when the provided description is not a string.  | 
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| 94 | * @return Schema  | 
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| 95 | */  | 
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| 96 | 2 |     public function setDescription($description) { | 
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| 105 | |||
| 106 | /**  | 
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| 107 | * Get a schema field.  | 
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| 108 | *  | 
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| 109 | * @param string|array $path The JSON schema path of the field with parts separated by dots.  | 
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| 110 | * @param mixed $default The value to return if the field isn't found.  | 
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| 111 | * @return mixed Returns the field value or `$default`.  | 
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| 112 | */  | 
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| 113 | 4 |     public function getField($path, $default = null) { | 
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| 130 | |||
| 131 | /**  | 
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| 132 | * Set a schema field.  | 
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| 133 | *  | 
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| 134 | * @param string|array $path The JSON schema path of the field with parts separated by dots.  | 
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| 135 | * @param mixed $value The new value.  | 
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| 136 | * @return $this  | 
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| 137 | */  | 
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| 138 | 3 |     public function setField($path, $value) { | 
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| 161 | |||
| 162 | /**  | 
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| 163 | * Get the ID for the schema.  | 
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| 164 | *  | 
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| 165 | * @return string  | 
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| 166 | */  | 
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| 167 | 3 |     public function getID() { | 
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| 170 | |||
| 171 | /**  | 
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| 172 | * Set the ID for the schema.  | 
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| 173 | *  | 
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| 174 | * @param string $id The new ID.  | 
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| 175 | * @throws \InvalidArgumentException Throws an exception when the provided ID is not a string.  | 
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| 176 | * @return Schema  | 
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| 177 | */  | 
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| 178 | 1 |     public function setID($id) { | 
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| 187 | |||
| 188 | /**  | 
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| 189 | * Return the validation flags.  | 
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| 190 | *  | 
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| 191 | * @return int Returns a bitwise combination of flags.  | 
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| 192 | */  | 
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| 193 | 1 |     public function getFlags() { | 
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| 196 | |||
| 197 | /**  | 
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| 198 | * Set the validation flags.  | 
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| 199 | *  | 
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| 200 | * @param int $flags One or more of the **Schema::FLAG_*** constants.  | 
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| 201 | * @return Schema Returns the current instance for fluent calls.  | 
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| 202 | */  | 
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| 203 | 8 |     public function setFlags($flags) { | 
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| 211 | |||
| 212 | /**  | 
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| 213 | * Whether or not the schema has a flag (or combination of flags).  | 
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| 214 | *  | 
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| 215 | * @param int $flag One or more of the **Schema::VALIDATE_*** constants.  | 
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| 216 | * @return bool Returns **true** if all of the flags are set or **false** otherwise.  | 
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| 217 | */  | 
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| 218 | 18 |     public function hasFlag($flag) { | 
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| 221 | |||
| 222 | /**  | 
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| 223 | * Set a flag.  | 
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| 224 | *  | 
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| 225 | * @param int $flag One or more of the **Schema::VALIDATE_*** constants.  | 
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| 226 | * @param bool $value Either true or false.  | 
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| 227 | * @return $this  | 
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| 228 | */  | 
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| 229 | 1 |     public function setFlag($flag, $value) { | 
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| 237 | |||
| 238 | /**  | 
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| 239 | * Merge a schema with this one.  | 
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| 240 | *  | 
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| 241 | * @param Schema $schema A scheme instance. Its parameters will be merged into the current instance.  | 
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| 242 | * @return $this  | 
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| 243 | */  | 
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| 244 | 3 |     public function merge(Schema $schema) { | 
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| 248 | |||
| 249 | /**  | 
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| 250 | * Add another schema to this one.  | 
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| 251 | *  | 
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| 252 | * Adding schemas together is analogous to array addition. When you add a schema it will only add missing information.  | 
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| 253 | *  | 
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| 254 | * @param Schema $schema The schema to add.  | 
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| 255 | * @param bool $addProperties Whether to add properties that don't exist in this schema.  | 
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| 256 | * @return $this  | 
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| 257 | */  | 
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| 258 | 3 |     public function add(Schema $schema, $addProperties = false) { | 
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| 262 | |||
| 263 | /**  | 
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| 264 | * The internal implementation of schema merging.  | 
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| 265 | *  | 
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| 266 | * @param array &$target The target of the merge.  | 
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| 267 | * @param array $source The source of the merge.  | 
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| 268 | * @param bool $overwrite Whether or not to replace values.  | 
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| 269 | * @param bool $addProperties Whether or not to add object properties to the target.  | 
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| 270 | * @return array  | 
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| 271 | */  | 
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| 272 | 6 |     private function mergeInternal(array &$target, array $source, $overwrite = true, $addProperties = true) { | 
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| 324 | |||
| 325 | // public function overlay(Schema $schema )  | 
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| 326 | |||
| 327 | /**  | 
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| 328 | * Returns the internal schema array.  | 
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| 329 | *  | 
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| 330 | * @return array  | 
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| 331 | * @see Schema::jsonSerialize()  | 
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| 332 | */  | 
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| 333 | 15 |     public function getSchemaArray() { | 
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| 336 | |||
| 337 | /**  | 
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| 338 | * Parse a short schema and return the associated schema.  | 
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| 339 | *  | 
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| 340 | * @param array $arr The schema array.  | 
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| 341 | * @param mixed ...$args Constructor arguments for the schema instance.  | 
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| 342 | * @return static Returns a new schema.  | 
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| 343 | */  | 
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| 344 | 160 |     public static function parse(array $arr, ...$args) { | 
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| 349 | |||
| 350 | /**  | 
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| 351 | * Parse a schema in short form into a full schema array.  | 
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| 352 | *  | 
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| 353 | * @param array $arr The array to parse into a schema.  | 
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| 354 | * @return array The full schema array.  | 
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| 355 | * @throws \InvalidArgumentException Throws an exception when an item in the schema is invalid.  | 
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| 356 | */  | 
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| 357 | 160 |     protected function parseInternal(array $arr) { | 
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| 389 | |||
| 390 | /**  | 
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| 391 | * Parse a schema node.  | 
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| 392 | *  | 
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| 393 | * @param array $node The node to parse.  | 
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| 394 | * @param mixed $value Additional information from the node.  | 
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| 395 | * @return array Returns a JSON schema compatible node.  | 
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| 396 | */  | 
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| 397 | 154 |     private function parseNode($node, $value = null) { | 
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| 447 | |||
| 448 | /**  | 
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| 449 | * Parse the schema for an object's properties.  | 
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| 450 | *  | 
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| 451 | * @param array $arr An object property schema.  | 
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| 452 | * @return array Returns a schema array suitable to be placed in the **properties** key of a schema.  | 
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| 453 | */  | 
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| 454 | 99 |     private function parseProperties(array $arr) { | 
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| 480 | |||
| 481 | /**  | 
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| 482 | * Parse a short parameter string into a full array parameter.  | 
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| 483 | *  | 
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| 484 | * @param string $key The short parameter string to parse.  | 
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| 485 | * @param array $value An array of other information that might help resolve ambiguity.  | 
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| 486 | * @return array Returns an array in the form `[string name, array param, bool required]`.  | 
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| 487 | * @throws \InvalidArgumentException Throws an exception if the short param is not in the correct format.  | 
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| 488 | */  | 
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| 489 | 154 |     public function parseShortParam($key, $value = []) { | 
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| 547 | |||
| 548 | /**  | 
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| 549 | * Add a custom filter to change data before validation.  | 
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| 550 | *  | 
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| 551 | * @param string $fieldname The name of the field to filter, if any.  | 
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| 552 | *  | 
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| 553 | * If you are adding a filter to a deeply nested field then separate the path with dots.  | 
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| 554 | * @param callable $callback The callback to filter the field.  | 
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| 555 | * @return $this  | 
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| 556 | */  | 
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| 557 | 1 |     public function addFilter($fieldname, callable $callback) { | 
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| 561 | |||
| 562 | /**  | 
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| 563 | * Add a custom validator to to validate the schema.  | 
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| 564 | *  | 
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| 565 | * @param string $fieldname The name of the field to validate, if any.  | 
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| 566 | *  | 
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| 567 | * If you are adding a validator to a deeply nested field then separate the path with dots.  | 
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| 568 | * @param callable $callback The callback to validate with.  | 
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| 569 | * @return Schema Returns `$this` for fluent calls.  | 
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| 570 | */  | 
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| 571 | 2 |     public function addValidator($fieldname, callable $callback) { | 
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| 575 | |||
| 576 | /**  | 
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| 577 | * Require one of a given set of fields in the schema.  | 
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| 578 | *  | 
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| 579 | * @param array $required The field names to require.  | 
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| 580 | * @param string $fieldname The name of the field to attach to.  | 
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| 581 | * @param int $count The count of required items.  | 
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| 582 | * @return Schema Returns `$this` for fluent calls.  | 
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| 583 | */  | 
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| 584 | 1 |     public function requireOneOf(array $required, $fieldname = '', $count = 1) { | 
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| 633 | |||
| 634 | /**  | 
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| 635 | * Validate data against the schema.  | 
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| 636 | *  | 
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| 637 | * @param mixed $data The data to validate.  | 
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| 638 | * @param bool $sparse Whether or not this is a sparse validation.  | 
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| 639 | * @return mixed Returns a cleaned version of the data.  | 
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| 640 | * @throws ValidationException Throws an exception when the data does not validate against the schema.  | 
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| 641 | */  | 
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| 642 | 155 |     public function validate($data, $sparse = false) { | 
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| 658 | |||
| 659 | /**  | 
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| 660 | * Validate data against the schema and return the result.  | 
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| 661 | *  | 
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| 662 | * @param mixed $data The data to validate.  | 
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| 663 | * @param bool $sparse Whether or not to do a sparse validation.  | 
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| 664 | * @return bool Returns true if the data is valid. False otherwise.  | 
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| 665 | */  | 
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| 666 | 35 |     public function isValid($data, $sparse = false) { | 
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| 674 | |||
| 675 | /**  | 
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| 676 | * Validate a field.  | 
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| 677 | *  | 
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| 678 | * @param mixed $value The value to validate.  | 
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| 679 | * @param ValidationField $field A validation object to add errors to.  | 
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| 680 | * @param bool $sparse Whether or not this is a sparse validation.  | 
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| 681 | * @return mixed|Invalid Returns a clean version of the value with all extra fields stripped out or invalid if the value  | 
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| 682 | * is completely invalid.  | 
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| 683 | */  | 
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| 684 | 155 |     protected function validateField($value, ValidationField $field, $sparse = false) { | 
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| 716 | |||
| 717 | /**  | 
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| 718 | * Validate an array.  | 
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| 719 | *  | 
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| 720 | * @param mixed $value The value to validate.  | 
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| 721 | * @param ValidationField $field The validation results to add.  | 
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| 722 | * @param bool $sparse Whether or not this is a sparse validation.  | 
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| 723 | * @return array|Invalid Returns an array or invalid if validation fails.  | 
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| 724 | */  | 
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| 725 | 27 |     protected function validateArray($value, ValidationField $field, $sparse = false) { | 
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| 780 | |||
| 781 | /**  | 
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| 782 | * Validate a boolean value.  | 
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| 783 | *  | 
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| 784 | * @param mixed $value The value to validate.  | 
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| 785 | * @param ValidationField $field The validation results to add.  | 
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| 786 | * @return bool|Invalid Returns the cleaned value or invalid if validation fails.  | 
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| 787 | */  | 
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| 788 | 25 |     protected function validateBoolean($value, ValidationField $field) { | 
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| 797 | |||
| 798 | /**  | 
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| 799 | * Validate a date time.  | 
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| 800 | *  | 
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| 801 | * @param mixed $value The value to validate.  | 
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| 802 | * @param ValidationField $field The validation results to add.  | 
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| 803 | * @return \DateTimeInterface|Invalid Returns the cleaned value or **null** if it isn't valid.  | 
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| 804 | */  | 
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| 805 | 14 |     protected function validateDatetime($value, ValidationField $field) { | 
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| 830 | |||
| 831 | /**  | 
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| 832 | * Validate a float.  | 
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| 833 | *  | 
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| 834 | * @param mixed $value The value to validate.  | 
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| 835 | * @param ValidationField $field The validation results to add.  | 
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| 836 | * @return float|Invalid Returns a number or **null** if validation fails.  | 
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| 837 | */  | 
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| 838 | 13 |     protected function validateNumber($value, ValidationField $field) { | 
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| 846 | /**  | 
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| 847 | * Validate and integer.  | 
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| 848 | *  | 
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| 849 | * @param mixed $value The value to validate.  | 
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| 850 | * @param ValidationField $field The validation results to add.  | 
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| 851 | * @return int|Invalid Returns the cleaned value or **null** if validation fails.  | 
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| 852 | */  | 
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| 853 | 33 |     protected function validateInteger($value, ValidationField $field) { | 
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| 862 | |||
| 863 | /**  | 
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| 864 | * Validate an object.  | 
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| 865 | *  | 
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| 866 | * @param mixed $value The value to validate.  | 
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| 867 | * @param ValidationField $field The validation results to add.  | 
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| 868 | * @param bool $sparse Whether or not this is a sparse validation.  | 
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| 869 | * @return object|Invalid Returns a clean object or **null** if validation fails.  | 
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| 870 | */  | 
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| 871 | 88 |     protected function validateObject($value, ValidationField $field, $sparse = false) { | 
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| 883 | |||
| 884 | /**  | 
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| 885 | * Validate data against the schema and return the result.  | 
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| 886 | *  | 
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| 887 | * @param array|\ArrayAccess $data The data to validate.  | 
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| 888 | * @param ValidationField $field This argument will be filled with the validation result.  | 
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| 889 | * @param bool $sparse Whether or not this is a sparse validation.  | 
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| 890 | * @return array|Invalid Returns a clean array with only the appropriate properties and the data coerced to proper types.  | 
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| 891 | * or invalid if there are no valid properties.  | 
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| 892 | */  | 
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| 893 | 86 |     protected function validateProperties($data, ValidationField $field, $sparse = false) { | 
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| 958 | |||
| 959 | /**  | 
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| 960 | * Validate a string.  | 
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| 961 | *  | 
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| 962 | * @param mixed $value The value to validate.  | 
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| 963 | * @param ValidationField $field The validation results to add.  | 
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| 964 | * @return string|Invalid Returns the valid string or **null** if validation fails.  | 
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| 965 | */  | 
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| 966 | 60 |     protected function validateString($value, ValidationField $field) { | 
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| 1055 | |||
| 1056 | /**  | 
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| 1057 | * Validate a unix timestamp.  | 
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| 1058 | *  | 
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| 1059 | * @param mixed $value The value to validate.  | 
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| 1060 | * @param ValidationField $field The field being validated.  | 
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| 1061 | * @return int|Invalid Returns a valid timestamp or invalid if the value doesn't validate.  | 
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| 1062 | */  | 
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| 1063 | 8 |     protected function validateTimestamp($value, ValidationField $field) { | 
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| 1074 | |||
| 1075 | /**  | 
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| 1076 | * Validate a null value.  | 
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| 1077 | *  | 
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| 1078 | * @param mixed $value The value to validate.  | 
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| 1079 | * @param ValidationField $field The error collector for the field.  | 
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| 1080 | * @return null|Invalid Returns **null** or invalid.  | 
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| 1081 | */  | 
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| 1082 |     protected function validateNull($value, ValidationField $field) { | 
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| 1089 | |||
| 1090 | /**  | 
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| 1091 | * Validate a value against an enum.  | 
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| 1092 | *  | 
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| 1093 | * @param mixed $value The value to test.  | 
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| 1094 | * @param ValidationField $field The validation object for adding errors.  | 
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| 1095 | * @return mixed|Invalid Returns the value if it is one of the enumerated values or invalid otherwise.  | 
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| 1096 | */  | 
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| 1097 | 153 |     protected function validateEnum($value, ValidationField $field) { | 
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| 1116 | |||
| 1117 | /**  | 
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| 1118 | * Call all of the filters attached to a field.  | 
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| 1119 | *  | 
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| 1120 | * @param mixed $value The field value being filtered.  | 
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| 1121 | * @param ValidationField $field The validation object.  | 
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| 1122 | * @return mixed Returns the filtered value. If there are no filters for the field then the original value is returned.  | 
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| 1123 | */  | 
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| 1124 | 155 |     protected function callFilters($value, ValidationField $field) { | 
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| 1134 | |||
| 1135 | /**  | 
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| 1136 | * Call all of the validators attached to a field.  | 
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| 1137 | *  | 
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| 1138 | * @param mixed $value The field value being validated.  | 
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| 1139 | * @param ValidationField $field The validation object to add errors.  | 
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| 1140 | */  | 
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| 1141 | 153 |     protected function callValidators($value, ValidationField $field) { | 
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| 1161 | |||
| 1162 | /**  | 
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| 1163 | * Specify data which should be serialized to JSON.  | 
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| 1164 | *  | 
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| 1165 | * This method specifically returns data compatible with the JSON schema format.  | 
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| 1166 | *  | 
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| 1167 | * @return mixed Returns data which can be serialized by **json_encode()**, which is a value of any type other than a resource.  | 
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| 1168 | * @link http://php.net/manual/en/jsonserializable.jsonserialize.php  | 
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| 1169 | * @link http://json-schema.org/  | 
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| 1170 | */  | 
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| 1171 |     public function jsonSerialize() { | 
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| 1206 | |||
| 1207 | /**  | 
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| 1208 | * Look up a type based on its alias.  | 
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| 1209 | *  | 
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| 1210 | * @param string $alias The type alias or type name to lookup.  | 
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| 1211 | * @return mixed  | 
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| 1212 | */  | 
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| 1213 | 150 |     protected function getType($alias) { | 
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| 1224 | |||
| 1225 | /**  | 
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| 1226 | * Get the class that's used to contain validation information.  | 
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| 1227 | *  | 
            ||
| 1228 | * @return Validation|string Returns the validation class.  | 
            ||
| 1229 | */  | 
            ||
| 1230 | 155 |     public function getValidationClass() { | 
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| 1233 | |||
| 1234 | /**  | 
            ||
| 1235 | * Set the class that's used to contain validation information.  | 
            ||
| 1236 | *  | 
            ||
| 1237 | * @param Validation|string $class Either the name of a class or a class that will be cloned.  | 
            ||
| 1238 | * @return $this  | 
            ||
| 1239 | */  | 
            ||
| 1240 | 1 |     public function setValidationClass($class) { | 
            |
| 1248 | |||
| 1249 | /**  | 
            ||
| 1250 | * Create a new validation instance.  | 
            ||
| 1251 | *  | 
            ||
| 1252 | * @return Validation Returns a validation object.  | 
            ||
| 1253 | */  | 
            ||
| 1254 | 155 |     protected function createValidation() { | 
            |
| 1264 | |||
| 1265 | /**  | 
            ||
| 1266 | * Check whether or not a value is an array or accessible like an array.  | 
            ||
| 1267 | *  | 
            ||
| 1268 | * @param mixed $value The value to check.  | 
            ||
| 1269 | * @return bool Returns **true** if the value can be used like an array or **false** otherwise.  | 
            ||
| 1270 | */  | 
            ||
| 1271 | 88 |     private function isArray($value) { | 
            |
| 1274 | |||
| 1275 | /**  | 
            ||
| 1276 | * Cast a value to an array.  | 
            ||
| 1277 | *  | 
            ||
| 1278 | * @param \Traversable $value The value to convert.  | 
            ||
| 1279 | * @return array Returns an array.  | 
            ||
| 1280 | */  | 
            ||
| 1281 |     private function toArray(\Traversable $value) { | 
            ||
| 1287 | |||
| 1288 | /**  | 
            ||
| 1289 | * Return a sparse version of this schema.  | 
            ||
| 1290 | *  | 
            ||
| 1291 | * A sparse schema has no required properties.  | 
            ||
| 1292 | *  | 
            ||
| 1293 | * @return Schema Returns a new sparse schema.  | 
            ||
| 1294 | */  | 
            ||
| 1295 | 2 |     public function withSparse() { | 
            |
| 1299 | |||
| 1300 | /**  | 
            ||
| 1301 | * The internal implementation of `Schema::withSparse()`.  | 
            ||
| 1302 | *  | 
            ||
| 1303 | * @param array|Schema $schema The schema to make sparse.  | 
            ||
| 1304 | * @param \SplObjectStorage $schemas Collected sparse schemas that have already been made.  | 
            ||
| 1305 | * @return mixed  | 
            ||
| 1306 | */  | 
            ||
| 1307 | 2 |     private function withSparseInternal($schema, \SplObjectStorage $schemas) { | 
            |
| 1335 | |||
| 1336 | /**  | 
            ||
| 1337 | * Filter a field's value using built in and custom filters.  | 
            ||
| 1338 | *  | 
            ||
| 1339 | * @param mixed $value The original value of the field.  | 
            ||
| 1340 | * @param ValidationField $field The field information for the field.  | 
            ||
| 1341 | * @return mixed Returns the filtered field or the original field value if there are no filters.  | 
            ||
| 1342 | */  | 
            ||
| 1343 | 155 |     private function filterField($value, ValidationField $field) { | 
            |
| 1367 | |||
| 1368 | /**  | 
            ||
| 1369 | * Whether a offset exists.  | 
            ||
| 1370 | *  | 
            ||
| 1371 | * @param mixed $offset An offset to check for.  | 
            ||
| 1372 | * @return boolean true on success or false on failure.  | 
            ||
| 1373 | * @link http://php.net/manual/en/arrayaccess.offsetexists.php  | 
            ||
| 1374 | */  | 
            ||
| 1375 | 3 |     public function offsetExists($offset) { | 
            |
| 1378 | |||
| 1379 | /**  | 
            ||
| 1380 | * Offset to retrieve.  | 
            ||
| 1381 | *  | 
            ||
| 1382 | * @param mixed $offset The offset to retrieve.  | 
            ||
| 1383 | * @return mixed Can return all value types.  | 
            ||
| 1384 | * @link http://php.net/manual/en/arrayaccess.offsetget.php  | 
            ||
| 1385 | */  | 
            ||
| 1386 |     public function offsetGet($offset) { | 
            ||
| 1389 | |||
| 1390 | /**  | 
            ||
| 1391 | * Offset to set.  | 
            ||
| 1392 | *  | 
            ||
| 1393 | * @param mixed $offset The offset to assign the value to.  | 
            ||
| 1394 | * @param mixed $value The value to set.  | 
            ||
| 1395 | * @link http://php.net/manual/en/arrayaccess.offsetset.php  | 
            ||
| 1396 | */  | 
            ||
| 1397 |     public function offsetSet($offset, $value) { | 
            ||
| 1400 | |||
| 1401 | /**  | 
            ||
| 1402 | * Offset to unset.  | 
            ||
| 1403 | *  | 
            ||
| 1404 | * @param mixed $offset The offset to unset.  | 
            ||
| 1405 | * @link http://php.net/manual/en/arrayaccess.offsetunset.php  | 
            ||
| 1406 | */  | 
            ||
| 1407 |     public function offsetUnset($offset) { | 
            ||
| 1410 | |||
| 1411 | /**  | 
            ||
| 1412 | * Validate a field against a single type.  | 
            ||
| 1413 | *  | 
            ||
| 1414 | * @param mixed $value The value to validate.  | 
            ||
| 1415 | * @param string $type The type to validate against.  | 
            ||
| 1416 | * @param ValidationField $field Contains field and validation information.  | 
            ||
| 1417 | * @param bool $sparse Whether or not this should be a sparse validation.  | 
            ||
| 1418 | * @return mixed Returns the valid value or `Invalid`.  | 
            ||
| 1419 | */  | 
            ||
| 1420 | 155 |     protected function validateSingleType($value, $type, ValidationField $field, $sparse) { | 
            |
| 1455 | |||
| 1456 | /**  | 
            ||
| 1457 | * Validate a field against multiple basic types.  | 
            ||
| 1458 | *  | 
            ||
| 1459 | * The first validation that passes will be returned. If no type can be validated against then validation will fail.  | 
            ||
| 1460 | *  | 
            ||
| 1461 | * @param mixed $value The value to validate.  | 
            ||
| 1462 | * @param string[] $types The types to validate against.  | 
            ||
| 1463 | * @param ValidationField $field Contains field and validation information.  | 
            ||
| 1464 | * @param bool $sparse Whether or not this should be a sparse validation.  | 
            ||
| 1465 | * @return mixed Returns the valid value or `Invalid`.  | 
            ||
| 1466 | */  | 
            ||
| 1467 | 23 |     private function validateMultipleTypes($value, array $types, ValidationField $field, $sparse) { | 
            |
| 1530 | }  | 
            ||
| 1531 | 
This check looks for multiple assignments in successive lines of code. It will report an issue if the operators are not in a straight line.
To visualize
will produce issues in the first and second line, while this second example
will produce no issues.